Silicon Laboratories SI4421 manual Si4421, BER Curves in 433 MHz Band, BER Curves in 868 MHz Band

Page 37

Si4421

BER Curves in 433 MHz Band:

1
10-1						1.2k
						1.2k
10-2						2.4k
10-3						4.8k
10-3						9.6k
						9.6k
10-4						19.2k
						38.4k
10-5						57.6k
10-6						115.2k
10-6
-120	-115	-110	-105	-100	-95	-90

BER Curves in 868 MHz Band:

1
10-1						1.2k
10-2						2.4k
10-2						4.8k
10-3						9.6k
10-3						19.2k
						19.2k
10-4						38.4k
10-5						57.6k
10-5						115.2k
10-6
-115	-110	-105	-100	-95	-90	-85

The table below shows the optimal receiver baseband bandwidth (BW) and transmitter deviation frequency (δfFSK ) settings for different data-rates supposing no transmit receive offset frequency. If TX/RX offset (for example due to crystal tolerances) have to be taken into account, increase the BW accordingly.

1.2 kbps	2.4 kbps	4.8 kbps	9.6 kbps	19.2 kbps	38.4 kbps	57.6 kbps	115.2 kbps
BW=67 kHz	BW=67 kHz	BW=67 kHz	BW=67 kHz	BW=67 kHz	BW=134 kHz	BW=134 kHz	BW=200 kHz
δfFSK =45 kHz	δfFSK =45 kHz	δfFSK =45kHz	δfFSK =45 kHz	δfFSK =45 kHz	δfFSK =90 kHz	δfFSK =90 kHz	δfFSK =120 kHz

Image 37

Contents FEATURES FUNCTIONAL BLOCK DIAGRAMDESCRIPTION TYPICAL APPLICATIONSRF Power Amplifier PA DETAILED FEATURE-LEVELDESCRIPTIONData Filtering and Clock Recovery Si4421Wake-UpTimer Low Battery Voltage DetectorData Validity Blocks Crystal OscillatorName Si4421 PACKAGE PIN DEFINITIONSType FunctionInternal Pin Connections Si4421Name Internal connectionPIN10 Logic Diagram nRES I/O PIN6 Logic Diagram FSK / DATA / nFFSNote These pins can be left floating Si4421Typical Application Si4421Recommended supply decoupling capacitor values Pin Function vs. Operation ModeAbsolute Maximum Ratings non-operating Si4421 GENERAL DEVICE SPECIFICATIONSRecommended Operating Range DC Characteristics ELECTRICAL SPECIFICATIONSi4421 AC Characteristics Receiver AC Characteristics PLL parametersSi4421 AC Characteristics Transmitter Si4421AC Characteristics Turn-on/Turnaroundtimings AC Characteristics OthersNote 10 By design Si4421Timing Specification Si4421 CONTROL INTERFACETiming Diagram Control Register Default Values Control CommandsSi4421 Configuration Setting Command Description of the Control Commands2. Power Management Command Si4421Si4421 Logic connections between power control bits4. Data Rate Command Frequency Setting Command5. Receiver Control Command Si4421Si4421 VDI Logic DiagramSi4421 6. Data Filter CommandSi4421 7.FIFO and Reset Mode Command9. Receiver FIFO Read Command 8. Synchron Pattern Command10. AFC Command Si4421Bit 5-4rl1 to rl0 Si4421Frequency Setting Command 11. TX Configuration Control CommandSi4421 12. PLL Setting Command 13. Transmitter Register Write CommandSi4421 15.Low Duty-CycleCommand 14. Wake-UpTimer CommandSi4421 Si4421 Vlb= 2.25 + V · 0.1 V Clock divider configurationSi4421 17. Status Read CommandBit Name Si4421 INTERRUPT HANDLING Si4421 TX REGISTER BUFFERED DATA TRANSMISSIONTypical TX register usage Si4421RECOMMENDED PACKET STRUCTURES Si4421 RX FIFO BUFFERED DATA READBit Rate 2.4 kbps Si4421 CRYSTAL SELECTION GUIDELINESBit Rate 9.6 kbps Bit Rate 38.4 kbpsSi4421 RX-TXALIGNMENT PROCEDURES Si4421 RESET MODES FIFO and Reset Mode Command page Sensitive Reset Enabled, Ripple on VddSW Reset Command Si4421Channel Selectivity and Blocking Si4421 TYPICAL PERFORMANCE CHARACTERISTICSBER Curves in 433 MHz Band Si4421BER Curves in 868 MHz Band 434 MHz Si4421Schematics Si4421 REFERENCE DESIGNSEvaluation Board with 50 Ohm Matching Network Frequency Dependent Component ValuesPCB Layout Top View Bottom View Si4421Si4421 SchematicsEvaluation Board with Resonant PCB Antenna BIFA Frequency Dependent Component ValuesPCB Layout Antenna designed for 868/915 MHz band Si4421Top View Bottom View 16-pinTSSOP Si4421 PACKAGE INFORMATIONSee Detail “A” Section B-B Si4421 Universal ISM Band FSK Transceiver RELATED PRODUCTS AND DOCUMENTSDemo Boards and Development Kits Related ResourcesSi4421